Helu Chromosome: Ke Kumu Hoʻoilina o ke Ola
ʻO nā chromosomes he mau ʻano macromolecular i loaʻa i loko o nā cell e pāʻani ana i kahi kuleana koʻikoʻi i ka mālama ʻana a me ka hoʻonohonoho ʻana i ka ʻike genetic. Loaʻa i kēlā me kēia meaola ola kahi helu ʻokoʻa o nā chromosomes, e hoʻoholo ai i kona ʻano genetic. E ʻimi kēia ʻatikala i ka helu o nā chromosomes i nā ʻano like ʻole, kona koʻikoʻi, a pehea e hoʻohuli ai i nā ʻano olaola a me ka ulu ʻana.
Ka Wehewehena a me ke ʻAno o nā Chromosomes
Aia nā chromosome i ka DNA i kāʻei ʻia a puni nā protein i kapa ʻia ʻo histones. Hoʻokumu kēia i kahi ʻano paʻa a hoʻonohonoho pono ʻia, e ʻae ana i ka mālama pono ʻana i ka ʻike genetic. I loko o ke kanaka, aia nā chromosome i loko o ka nucleus cell a loaʻa i nā moʻo DNA lōʻihi a pōʻai, e lawe ana i nā tausani o nā genes e hoʻopili ana i nā kuhikuhi olaola e pono ai no ka ulu ʻana, ka hoʻomohala ʻana, a me ka hana o kēlā me kēia meaola.
Ke Koʻikoʻi o ka Helu Chromosome
He mea nui ka helu chromosome i ka genetics no ka mea e hoʻoholo ai i ke kūpaʻa o ka genome o kahi meaola. I nā hihia he nui, pili pono ka helu chromosome i ka hiki o kahi meaola ke hana hou a ola. ʻO ke kanaka, no ka laʻana, he 23 mau pālua o nā chromosome, a he 46 ka huina. No kēia mau pālua 23, ua ʻike ʻia he 22 he autosomes, a ʻo hoʻokahi pālua ka chromosome sex, ka mea e hoʻoholo ai i ke kāne o ke kanaka: XX no nā wahine a me XY no nā kāne.
ʻOkoʻa ka Helu Chromosome ma nā ʻAno like ʻole
ʻOkoʻa loa ka helu o nā chromosomes ma waena o nā ʻano like ʻole. Eia kekahi laʻana:
– Kanaka (Homo sapiens): 46 chromosomes.
– Lio (Equus ferus caballus): 64 chromosomes.
– ʻIlio (Canis lupus familiaris): 78 chromosomes.
– Cat (Felis catus): 38 chromosomes.
– Mea kanu kulina (Zea mays): 20 chromosomes.
I loko o ke ao mea kanu, hiki ke ʻoi aku ka nui o nā loli o ka helu chromosome. Loaʻa i kekahi mau mea kanu he mau haneli a he mau tausani o nā chromosomes. Ua kapa ʻia kēia hanana he polyploidy, kahi e hana ʻia ai i ka wā e loaʻa ai i nā meaola ma mua o ʻelua mau seti o nā chromosomes. No ka laʻana, hōʻike pinepine nā mea kanu palaoa a me ka ʻuala i ka polyploidy.
Ka Hopena o ka Helu Chromosome ma ka Evolution
He kuleana koʻikoʻi ka helu a me ke ʻano o nā chromosomes i ka ulu ʻana o nā meaola. Hiki i nā loli i ka helu a i ʻole ke ʻano o nā chromosomes ke alakaʻi i nā loli nui i ke ʻano genetic o kahi meaola. No ka laʻana, hiki i ka chromosome fusion a i ʻole ka hoʻokaʻawale ʻana ke alakaʻi i ka speciation, ka hoʻokumu ʻia ʻana o nā ʻano hou.
ʻO kahi laʻana kaulana ka ulu ʻana o ka chromosome 2 i loko o ke kanaka. Hoʻokahi chromosome emi ko ke kanaka ma mua o ko lākou mau hoahānau pili loa, ʻo nā chimpanzees, nona 48. Hōʻike ka loiloi genetic ʻo ka chromosome 2 kanaka ka hopena o ka hui ʻana o ʻelua mau chromosome kūpuna i loko o nā primates.
ʻAnomaly Helu Chromosome
ʻAʻole mālama nā meaola āpau i kahi helu chromosome kūlike. He mea maʻamau nā ʻano ʻē o ka helu chromosome a hiki ke loaʻa nā hopena koʻikoʻi, ʻoi aku hoʻi i ke olakino kanaka. Hoʻokumu ʻia kekahi mau kūlana genetic e nā chromosome keu a nalowale paha, i ʻike ʻia ʻo aneuploidy. ʻO nā hiʻohiʻona o kēia mau kūlana:
– Down syndrome: Hana ʻia e ke alo o ke kolu o ka kope o ka chromosome 21. ʻO nā kānaka me kēia syndrome e ʻike i nā ʻano like ʻole o ka lohi o ka noʻonoʻo a me ka ulu kino.
ʻO ka maʻi Turner: He maʻi e kū mai ana i nā wahine ke nalowale loa a hapa paha kekahi o nā chromosomes X, e hopena ana i ka huina o 45 mau chromosomes.
– ʻO ka maʻi Klinefelter: He kūlana i nā kāne e pili ana i ka loaʻa ʻana o hoʻokahi a ʻoi aku paha mau chromosomes X keu, ʻo ka maʻamau he 47,XXY.
ʻAʻole wale kēia mau haʻawina aneuploidy he mea nui no ka hōʻoia lapaʻau a me ka genetics, akā hāʻawi pū kekahi i nā ʻike waiwai i ka pehea e hiki ai i nā ʻano like ʻole o nā chromosomal ke hoʻopilikia i ka phenotype.
Noiʻi a me nā Holomua i nā Haʻawina Chromosome
Ua hiki i nā holomua ʻenehana i ka biology molecular ke hoʻomau i ka noiʻi ʻana i nā chromosomes a me ko lākou helu. ʻO nā ʻano hana e like me ka karyotyping, kahi e hiki ai iā mākou ke nānā i nā chromosomes ma lalo o kahi microscope, a me nā ʻenehana hou e like me ka genome sequencing ua hoʻololi i ko mākou ʻike i ke ʻano a me ka hana o ka chromosome.
Loaʻa i ka noiʻi chromosome nā noi kūpono i ka mahiʻai a me ka lāʻau lapaʻau. No ka laʻana, ma ka hoʻopunipuni ʻana i ka helu o nā chromosome i nā mea kanu, hiki i nā kānaka ʻepekema ke hana i nā ʻano hou i ʻoi aku ka pale ʻana i nā maʻi a i ʻole he nui aʻe ka hua. I ka lāʻau lapaʻau, ʻo ka hoʻomaopopo ʻana i nā chromosome a me ka genetics e kōkua i ka hoʻomohala ʻana o ka gene therapy a me ka lāʻau lapaʻau pololei e kuhikuhi ana i nā maʻi genetic kikoʻī.
Ka hopena
ʻO ka helu chromosome kahi mea nui i ka biology genetic e hoʻohuli i ka hana a me ka ulu ʻana o nā meaola. ʻO ka ʻokoʻa o nā helu chromosome i ke kūlohelohe e hāʻawi i nā ʻike hohonu i ke ʻano o ke ola e hoʻololi a ulu i nā kūlana kaiapuni like ʻole. I ka hoʻomau ʻana o ka ʻenehana a me nā ʻano noiʻi i ka holomua, e hoʻomau ko mākou ʻike i nā chromosome i ka oʻo ʻana, e kōkua ana i ka hoʻoponopono ʻana i nā mea pohihihi genetic i hoʻoholo ʻole ʻia a me ka hāʻawi ʻana i nā hopena hou i nā pilikia olakino a me ka mahiʻai i ka wā e hiki mai ana.
